<div class="doc-item" id="doc-901"><h2 class="doc-item-name">group-by<span class="namespace">(clojure.contrib.seq-utils)</span></h2><ul class="var-arglists"><li>(<span class="var-name">group-by</span> f coll)</li></ul><div class="var-docstring"><p>Returns a sorted map of the elements of coll keyed by the result of
  f on each element. The value at each key will be a vector of the
  corresponding elements, in the order they appeared in coll.</p></div><div class="var-source"><pre>; clojure/contrib/seq_utils.clj:63
(defn group-by 
  [f coll]
  (reduce
   (fn [ret x]
     (let [k (f x)]
       (assoc ret k (conj (get ret k []) x))))
   (sorted-map) coll))</pre></div><div class="license"><p>Copyright (c) Rich Hickey. All rights reserved.</p><p>The use and distribution terms for this software are covered by the <a href="http://opensource.org/licenses/eclipse-1.0.php">Eclipse Public License 1.0</a>, which can be found in the file
          epl-v10.html at the root of this distribution. By using this software
          in any fashion, you are agreeing to be bound by the terms of this
          license. You must not remove this notice, or any other, from this
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